DYS SN/BL20A protector

This is a housing/fastener for the popular DYS SN20A/BL20A multicopter ESC to protect it from damage and bending of the PCB. Designed for minimum weight, maximum cooling and easy printing, with notches to tie-wrap to the arm. Flip 180 degrees for easy printing without support. Did not bother with fillets/chamfers, can be easily sanded/filed after printing if desired.